1.0djokohttps://djoko.nl/home6Jean-François Roebershttps://djoko.nl/home6/index.php/author/jean_admin/rich600338<blockquote class="wp-embedded-content" data-secret="AML25w4bSS"><a href="https://djoko.nl/home6/index.php/2025/03/14/worteltrekken-leuk/">Worteltrekken, leuk?</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://djoko.nl/home6/index.php/2025/03/14/worteltrekken-leuk/embed/#?secret=AML25w4bSS" width="600" height="338" title="“Worteltrekken, leuk?” — djoko" data-secret="AML25w4bSS" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://djoko.nl/home6/wp-includes/js/wp-embed.min.js </script> Heb je geen fijne herinneringen aan wiskunde op de middelbare school? Lees dan eens het boek Algebra, van algoritmes tot vectoren van Michael Willers. Ik vond het voor minder van 10 euro in een boekwinkel in Rotterdam en was direct geboeid. Korte hoofdstukken over getallenreeksen maar ook over bijv. Egyptenaren. Zij gebruikten een tientallig getallenstelsel […]